| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Campbell Oil & Gas Inc | Indiana, PA 15701-0278 | Oil & Gas Operator | Sep 2025 |
| 2 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 3 | Castle Gas Company Inc | Pittsburgh, PA 15236-2466 | Oil & Gas Operator | Dec 2007 |
| 4 | CNG Development Co | Oil & Gas Operator | Dec 2008 | |
| 5 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Sep 2025 |
| 6 | Consol Gas Company | Canonsburg, PA 15317 | Oil & Gas Operator | Dec 2021 |
| 7 | Coterra Energy Inc | Pittsburgh, PA 15275-1121 | Oil & Gas Operator | Sep 2025 |
| 8 | Cottonwood Prod Co Inc | Buffalo, NY 14202-2212 | Gas Operator | Dec 2002 |